* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  user-select: none;
}
.App {
  width: 200px;
  height: 50px;
  background-color: aqua;
  line-height: 50px;
  text-align: center;
  margin: 300px auto;
  cursor: pointer;
}
